Circular saw

Abstract

A circular saw is made with carbide-tipped teeth arranged in pairs to effect a so-called "triple-chip" cutting operation for thermoplastic materials. Both teeth of each operational pair have two negatively-raked cutting edges which slope toward each other at the outer extremity of the teeth to a transverse radially outermost cutting edge. The so-called "high" tooth of each pair has its transverse cutting edge radially offset a greater distance from the rotational axis of the saw than the corresponding transverse edge of each low tooth. The lateral negatively-raked cutting edges of each low tooth are laterally separated a greater distance than the corresponding sloping cutting edges of the high tooth. Saws of this character are specially useful for cutting plastic materials and particularly materials such as acrylics and vinyls.

I claim: 
     
       1. A circular saw having a hard disc-like body with pairs of cutting teeth at its periphery, each pair of teeth consisting of one high tooth (13) and one low tooth (15), and characterized in that: a. both teeth of each pair have two laterally-separated negatively-raked cutting edges which slope toward each other from the sides of the tooth to a transverse radially outer cutting edge which is parallel to the rotational axis of the saw;   b. the transverse radially outer cutting edge of each high tooth (13) being radially offset a greater distance from the rotational axis of the saw than the corresponding transverse edge of each low tooth 15; and   c. the negatively-raked sloping cutting edges of each low tooth (15) being laterally separated a greater amount than the lateral separation between the negatively-raked sloping cutting edges of each high tooth (13).